Modal verbs for obligation, prohibition and advice

I'm going to China soon. I must / don't have to buy a guidebook.

• must

• don't have to

The plane leaves at 9 a.m., but we mustn't / don't have to be there until 7 a.m.

• mustn't

• don't have

It's going to be very hot at the beach. We mustn't / must forget the sun cream.

• mustn't

• must

If you're tired, you ....

• mustn't weigh more than 15 kilos.

• should have a sleep.

• don't have to drive to the airport.

My sister's 18 now, so she ....

• has to pay the full price for tickets.

• should have a sleep.

• mustn't weigh more than 15 kilos.

You _______ about anything - everything will be fine.

• mustn't worry

• shouldn't ask

• will have to ask

I'd love to go on a camping trip with you , but I ____ my parents first.

• mustn't pay

• must go

• will have to ask

I would advise you to look online for the best deals.

You ________ for the best deals. (SHOULD)

It isn't necessary to buy tickets in advance.

You _____ tickets in advance. (have)

It's a good idea to wear a sun hat when it's very hot.

You _____ a sun hat when it's very hot. (OUGHT)